Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/08—Sensitivity-increasing substances
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/08—Sensitivity-increasing substances
  • G03C1/09—Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
  • G03C2001/03517—Chloride content
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/08—Sensitivity-increasing substances
  • G03C2001/0854—Indium

Definitions

• the present invention relates to a silver halide photographic light-sensitive material, more specifically to a highly sensitive silver halide photographic light-sensitive material with improved reciprocity law characteristics and reduced latent image regression.
• silver chloride emulsion and silver chlorobromide emulsion having a high silver chloride content have problems such as large fogging, low sensitivity and poor reciprocity law characteristics, that is, sensitivity and gradation greatly vary depending on exposure illumination intensity.
• a method is disclosed in Japanese Patent O.P.I. Publication No. 183647/1989 in which iron ions are added to the silver chloride rich silver halide having a silver bromide phase of high silver bromide content in order to realize high sensitivity, improved reciprocity law characteristics, and reduced change in sensitivity and gradation caused by temperature changes during exposure.
• this method does solve the aforementioned problems, when the time from exposure to processing is long, sensitivity greatly varies, that is, stability of the latent image is greatly lowered.
• Japanese Patent O.P.I. Publication No. 135832/1980 discloses a method in which high sensitivity and improved reciprocity law characteristics are simultaneously achieved by doping cadmium, lead, copper, and zinc. The present inventors have examined this method, and have found that high sensitivity and improved reciprocity law characteristics were not simultaneously obtained.
• Japanese Patent O.P.I. Publication No. 20852/1990 discloses a silver halide emulsion which contains a transition metal having a nitrosyl or thionitrosyl ligand. Such transition metals, however, desensitize the emulsion.
• Japanese Patent O.P.I. Publication Nos. 20853/1990 and 20855/1990 disclose methods in which high sensitivity is realized by adding a complex comprising a cyano ligand.
• the cyano ligand is highly toxic and pollutes the environment, thereby manufacturing this method impractical.
• the object of the present invention is to provide a silver halide photographic light-sensitive material with high sensitivity, improved reciprocity law characteristics as well as reduced latent image regression.
• the foregoing object of the invention is achieved by a method of manufacturing a silver halide photographic emulsion containing silver halide grains comprising forming the silver halide grains in the presence of at least one substance selected from the group consisting of gallium, germanium, indium and compounds thereof; and a silver halide photographic light-sensitive material comprising at least one light-sensitive layer having a silver halide emulsion, wherein the silver halide emulsion contains at least one of gallium, germanium, iridium and a compound thereof.
• the halide composition of silver halide grains in the silver halide emulsion is silver chlorobromide having a silver chloride content of not less than 90 mol% and containing virtually no silver iodide, wherein the grains comprise localized silver bromide phase having a silver bromide content of 10 to 90 mol% at an inner phase internally or on the surface, and contains at least one of gallium, germanium, indium, thallium and a compound thereof. This is because the effect of the invention is brought out more positively.
• the phrase, "forming the silver halide grains in the presence of at least one substance selected from the group consisting of gallium, germanium, indium and compounds thereof" means that the elements or the compound may be introduced before grain formation into a reaction vessel, or added successively or at once during grain formation. It is preferable that the compound of the invention is present within the grains.
• preferable grains for the effective embodiment of the invention are silver chlorobromide grains having a silver chloride content of 90 mol% or more, preferably not less than 95 mol%, more preferably 98 to 99.9 mol%, and still more preferably 99.3 to 99.9 mol%, and containing substantially no iodide.
• the silver halide grains of the present invention may have a uniform composition, but preferably each grain has a localized silver bromide phase at an internal phase or on the surface.
• the grains may be mixed with other silver halide grains of different composition.
• the silver halide grains containing not less than 90 mol% silver chloride content are contained in an amount of preferably not less than 60 mol%, and particularly not less than 80 mol% of the total silver halide grains in the emulsion layer.
• the silver halide grains may be of any size, but from the viewpoint of rapid processing, high sensitivity, and other photographic properties the grain size is preferably in the range of 0.2 to 1.6 ⁇ m, and more preferably in the range of 0.25 to 1.2 ⁇ m.
• the grain size can be measured using any of various conventional methods used in the art. Typical methods are disclosed in "Grain Size Analysis,” by Loveland (A.S.T.M. Symposium on Light Microscopy, 1955, pp. 94 ⁇ 122) and "Theory of Photographic Process,” by Meath and James (published by Macmillan Publishing Co., 1966, 3rd edition, chapter 2).
• the grain size can be determined from the projected area of grain or approximate grain diameter.
• the grain size distribution of grains having essentially a uniform shape can be measured quite accurately from the diameter and projected area of grain.
• the grain size distribution of the silver halide grains may be either polydispersed or monodispersed, with preference given to a monodispersed silver halide grain having a grain size distribution defined by a coefficient of variation of not more than 0.22, more preferably not more than 0.15.
• the size of a spherical silver halide grain is defined by its diameter and that of a cubic and other nonspherical grains is defined by the diameter equivalent to the area of a disk formed by the projected area of grain.
• the silver halide emulsion of the present invention may be prepared by the acidic method, the neutral method, or the ammonical method.
• the grains may be grown all at once or grown after seed grain formation. The same or different methods may be used to prepare and grow seed grains.
• the normal precipitation method, the reverse precipitation method, or the simultaneous precipitation method may be used singly or in combination, with preference given to the simultaneous precipitation method.
• a usable method is the pAg controlled double jet method, which is disclosed, for example, in Japanese Patent O.P.I. Publication No. 48521/1979.
• Examples of equipment which may be used include: (1) An equipment whose nozzles in reacting mother liquor supply an aqueous solution of water-soluble silver salt and that of a water-soluble halide, disclosed in, for example, Japanese Patent O.P.I. Publication Nos. 92523/1982 and 92524/1982, (2) an equipment which adds an aqueous solution of water-soluble silver salt and that of water-soluble halide while successively changing the concentration, disclosed in, for example, German Patent No. 2921164, and (3) an equipment which forms grains by taking out the reacting mother liquor out of reaction vessel and concentrating the liquor by superfilteration, while keeping the distance among forming silver halide grains constant, disclosed in, for example, Japanese Patent Examined Publication No. 501776/1981.
• a silver halide solvent such as thioether may also be used.
• a compound containing mercapto group, a nitrogen-containing heterocyclic compound, or a sensitizing dye compound may be added either during silver halide grain formation or after completion of grain formation.
• the silver halide grain of the present invention may have any shape.
• a preferred shape is a cube having 100 planes forming a crystal surface. It is also possible to use an octahedral, tetradecahedral, dodecahedral, or other grain forms prepared by the methods disclosed in US Patent Nos. 4,183,756 and 4,225,666, Japanese Patent O.P.I. Publication No. 26589/1980, Japanese Patent Examined Publication No. 42737/1980, the Journal of Photographic Science, pp. 21 and 39 (1973), and other documents. Grains having twin crystal planes may also be used.
• the silver halide grains may have a uniform shape or a combination of various shapes.
• metal ions may be incorporated at an internal phase in and/or on the surface of the grains by adding a cadmium salt, a zinc salt, a lead salt or a complex salt thereof, a thallium salt, a rhodium salt or complex salt thereof, an iron salt, or an iridium salt or complex salt thereof, with preference given to an iridium salt or an iron salt.
• a reduction sensitization speck can be provided in and/or on the grains by subjecting the grains to a reducing atmosphere.
• the unnecessary soluble salts contained in the silver halide grains in the emulsion may be removed from or retained in the grains after completion of silver halide grain growth. In the former case, the salts are removed by the method disclosed in Research Disclosure No. 17643.
• the silver halide grains used in the emulsion may be grains with which latent images are formed mainly on the grain surface, or grains with which latent images are mainly formed therein, with preference given to grains with which latent images are mainly formed on the grain surface.
• the emulsion can be optically sensitized to the desired wavelength using a sensitizing dye.
• Sensitizing dyes which may be used include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styrl dyes, and hemioxanol dyes.
• Methods which may be used singly or in combination to sensitize the silver halide emulsion include those which use a reducing substance, a chalcogen sensitizer, or a noble metal compound, but sulfur sensitization, gold sensitization, and gold-sulfur sensitization (combination of sulfur and gold sensitization methods) are given particular preference in the invention.
• Chalcogen sensitizers which may be used include sulfur sensitizer, selenium sensitizer, and tellurium sensitizer, with preference given to sulfur sensitizer.
• sulfur sensitizers include thiosulfate salt, arylthiocarbamide, thiourea, arylisothianate, cystine, p-toluenethiosulfonate salt, and rhodanine.
• gold sensitizer As a noble metal sensitizer, gold sensitizer is preferred.
• the gold sensitizer which may be used include those having an oxidation number of 1 or 3 such as chloroauric acid and potassium chloroaurate.
• the silver halide grains comprise at least one of gallium, germanium, inidium or a salt thereof, with preference given to gallium and germanium, and particular preference given to gallium.
• Examples include: (1) GaCl3, (2) GaCl2, (3) Ga(NO3)3, (4) Ga2O3, (5) Ga, (6) GeCl4, (7) GeO4, (8) Ge, (9) InCl3, (10) KInCl4 , (11) In(OH)3, (12) In2(SO4)3, (13) In2O4, (14) In, (15) TlCl, and (16) K3TlCl6.
• These compounds I are used in an amount of 10 ⁇ 9 to 10 mol per mol of silver, and preferably 10 ⁇ 7 to 10 ⁇ 4 mol per mol of silver.
• the light-sensitive material of the invention to be used is a color light-sensitive material
• a dye-forming coupler which forms a dye that absorbs the spectral band the emulsion layer having the coupler is sensitive to. Accordingly, a yellow dye-forming coupler is used in a blue-sensitive emulsion layer, a magenta dye-forming coupler in a green-sensitive emulsion layer, and a cyan dye-forming coupler in a red-sensitive emulsion layer.
• coupler-emulsion combinations may be used to prepare a color light-sensitive material suited to the purposes.
• the light-sensitive material of the invention may incorporate an anti-foggant, an image stabilizer, a hardener, a plasticizer, an anti-irradiation dye, a polymer latex, an ultraviolet absorbent, a formalin scavenger, a developing accelerator, a developing retarder, a brightening agent, a matting agent, a lubricant, an antistatic agent, a surfactant, or other additives.
• an anti-foggant an image stabilizer, a hardener, a plasticizer, an anti-irradiation dye, a polymer latex, an ultraviolet absorbent, a formalin scavenger, a developing accelerator, a developing retarder, a brightening agent, a matting agent, a lubricant, an antistatic agent, a surfactant, or other additives.
• Compounds thereof are described, for example, in Japanese Patent O.P.I. Publication Nos. 215272/1987 and 46436/1988.
• the light-sensitive material of the invention may be used to form an image by a color developing method known in the photographic industry.
• AgX means silver halide
• the pAg was controlled according to a method disclosed in Japanese Patent O.P.I. Publication No. 45437/1984.
• the pH was controlled with an aqueous sulfuric acid or sodium hydroxide solution.
• (Solution A) Sodium chloride 3.42 g Potassium bromide 0.03 g Water was added to 200 ml.
• (Solution B) Silver nitrate 10 g Water was added to 200 ml.
• Solution C Sodium chloride 78.7 g Potassium bromide 0.157 g Water was added to 446 ml.
• Solution D Silver nitrate 190 g Water was added to 380 ml.
• the resulting mixture was desalinized with a 10% aqueous solution of Demol N, a product of Kao Atlas, and a 30% aqueous magnesium sulfate solution, and then mixed with an aqueous solution of gelatin in order to obtain a monodispersed emulsion EMP-1 comprising cubic grains having an average grain size of 0.40 ⁇ m, a coefficient of variation of 0.07, and a silver chloride content of 99.9 mol%.
• EMP-1 was optimally sensitized at 65°C using the following compounds to prepare a green-sensitive silver halide emulsion Em-1.
• Em-3 was prepared in the same way as in Em-1, except that compound No. I-3 of the invention was added to solution C in an amount of 5 ⁇ 10 ⁇ 5 mol per mol of silver.
• Em-4 and Em-5 were prepared in the same way as in Em-3, except that I-9 and I-15 were respectively added instead of I-3, each in the same amount as I-3, and that K2IrCl6 to solution C in an amount of 4 ⁇ 10 ⁇ 8 mol per mol of silver.
• Em-6 was prepared in the same way as in Em-3, except that K2IrCl6 was added to solution C in an amount of 4 ⁇ 10 ⁇ 8 mol per mol of silver.
• Em-7 and Em-8 were prepared in the same way as in Em-6, except that IR-1 and IR-2 were respectively added instead of I-3 as comparative examples, each in the same amount as I-3.
• each sample was subjected to color development according to the following process. Then, the density of the sample was measured using an optical densitometer PDA-65 (product of Konica Corp.), and then was expressed as the logarithm of the reciprocal of exposure necessary to obtain a density 0.8 higher than fog density. Sensitivity of the sample was expressed as a sensitivity relative to a sensitivity of sample 101 defined as 100.
• Reciprocity law failure characteristic was expressed as a sensitivity at 100 second exposure relative to a sensitivity at 0.05 second exposure defined as 100.
• Processing steps Temperature Time Color developing 35.0 ⁇ 0.3°C 45 sec. Bleach-fixing 35.0 ⁇ 0.5°C 45 sec. Stabilizing 30 ⁇ 34°C 90 sec. Drying 60 ⁇ 80°C 60 sec.
• Stablizer 5-chloro-2-methyl-4-isothiazoline-3-one 1.0 g Ethylene glycol 1.0 g 1-hydroxyethylidene-1,1-diphosphonic acid 2.0 g Ethylenediaminetetraacetic acid 1.0 g Ammonium hydroxide (20% aqueous solution) 3.0 g Brightening agent (4,4'-diaminostylbenedisulfonic acid derivative) 1.5 g Water was added to 1 liter, and the pH was adjusted to 7.0 using sulfuric acid or potassium hydroxide. The evaluation results are shown below. Sample No.
• Emulsion Compound (I) Iridium salt Sensitivity Reciprocity law Stability of latent image 101 (comparative) Em-1 - No 100 67 100 102 (comparative) Em-2 - Yes 90 81 10 103 (inventive) Em-3 I-3 No 115 79 98 104 (inventive) Em-4 I-9 Yes 119 83 102 105 (inventive) Em-5 I-15 Yes 125 84 101 106 (inventive) Em-6 I-3 Yes 118 87 98 107 (comparative) Em-7 IR-1 Yes 95 79 105 108 (comparative) Em-8 IR-2 Yes 45 80 106
• the samples of the invention have high sensitivity, improved reciprocity law characteristics and latent image stability.
• the samples containing iridium salt have improved reciprocity law characteristics, but have disadvantages that sensitivity and latent image stability deteriorate.
• each of the samples of the invention has improved reciprocity law characteristics, with both sensitivity and latent image stability improved simultaneously.
• Em-9 and Em-10 were prepared in the same way as in Em-2 and Em-6, except that sodium thiosulfate, sodium chloroaurate, and SB-1 were used for chemical sensitization.
• Sample Nos. 109 and 110 were formed by coating Em-9 and Em-10 on a support, respectively in the same way as in Em-1. Each of the samples was evaluated in the same way as in Example 1 and the results are as follows.
• Sample No. Emulsion Sodium chloroaurate Compound (I) Sensitivity Reciprocity law characteristics Stability of latent image 106 (inventive) Em-6 No I-3 118 87 98 110 (inventive) Em-10 Yes I-3 242 86 102 102 (comparative) Em-2 No - 90 81 107 109 (comparative) Em-9 Yes - 198 75 113
• sample No. 109 subjected to sensitization using sodium chloroaurate in particular, has excellent sensitivity but poor reciprocity law characteristics. Also, the samples containing iridium have significantly poor reciprocity law characteristics and latent image stability. In the samples of the invention, it is clear that sensitivity and reciprocity law characteristics as well as maintenance of latent image stability are improved.
• This emulsion was optimally sensitized at 65°C by adding 0.8 mg/mol of AgX of sodium thiosulfate, 6 ⁇ 10 ⁇ 4 mol/mol of AgX of SB-1, and 4 ⁇ 10 ⁇ 4 mol/mol of AgX of sensitizing dye BS-1.
• the resulting blue-sensitive silver halide emulsion was designated Em-11. Note that K2IrCl6 was added to solution C in an amount of 1 ⁇ 10 ⁇ 8 mol/mol of AgX.
• Em-12 was prepared in the same way as in Em-11, except that I-3 was added to solution C in an amount of 1 ⁇ 10 ⁇ 5 mol/mol of AgX.
• Em-13 and Em-14 were prepared in the same way as in Em-11 and Em-12, respectively, except that sensitization was performed by adding 1.5 mg/mol of AgX of sodium chloroaurate.
• This emulsion was optimally sensitized at 67°C by adding 2.0 mg/mol of AgX of sodium thiosulfate, 7 ⁇ 10 ⁇ 4 mol/mol of AgX of SB-1, and 7 ⁇ 10 ⁇ 5 mol/mol of AgX of sensitizing dye RS-1.
• the resulting red-sensitive silver halide emulsion was designated Em-15. Note that K2IrCl6 was added to solution C in an amount of 3 ⁇ 10 ⁇ 8 mol/mol of AgX. Em-16 was prepared in the same way as in Em-15, except that I-3 was added to solution C in an amount of 1.4 ⁇ 10 ⁇ 5 mol/mol of AgX.
• Em-17 and Em-18 were prepared in the same way as in Em-15 and Em-16, respectively, except that sensitization was performed by adding 0.3 mg/mol of AgX of sodium chloroaurate.
• Layers with the following compositions shown in Tables 2 and 3 were formed by coating on a paper support having polyethylene lamination on one face and polyethylene lamination containing titanium oxide on the other (photographic composition layer side) to obtain a multilayered color light-sensitive sample No. 201.
• the coating solutions were prepared as follows.
• the coating solutions for the 2nd through the 7th layers were prepared in the same way as in the coating solution for the 1st layer above.
• H-2 was added to the 2nd and 4th layers
• H-1 was added to the 7th layer.
• surfactants (SU-2) and (SU-3) were added to adjust the surface tension.
• Sample Nos. 202 to 204 were prepared in the same way as in sample No. 201, except that the emulsions used in the light-sensitive emulsion layers were changed to those given in Table 4.
• Table 4 Sample No. Emulsion layer Compound (1) Sensitization* Blue-sensitive Em-B Green-sensitive Em-G Red-sensitive Em-R 201 (comparative) Em-11 Em-2 Em-15 - No 202 (inventive) Em-12 Em-6 Em-16 I-3 No 203 (comparative) Em-13 Em-9 Em-17 - Yes 204 (inventive) Em-14 Em-10 Em-18 I-3 Yes *Sensitization using sodium chloroaurate.
• Sample Nos. 201 to 204 were exposed and processed in the same way as in Example 1, except that blue-, green-, and red filter were used during exposure. Then, the samples were evaluated in the same way as in Example 1. The sensitivity of the samples was expressed relative to a sensitivity of sample No. 201 defined as 100. The fog density of layer, which was measured using the optical densitometer PDA-65 (product of Konica Corp.), was expressed relative to that of the corresponding color-sensitive layer of sample No. 201. The obtained results are given below. Sample No.
• Sample No. 204 of the invention chemically sensitized using sodium chloroaurate, in particular, shows marked improvement in reciprocity law characteristics and latent image stability with high sensitivity compared to those of comparative sample No. 203 sensitized using the same compound.
• samples chemically sensitized using sodium chloroaurate exhibit satisfactory improvements in reciprocity law characteristics, latent image stability, and offer high sensitivity.
• Emulsions comprising individual grains having a localized silver bromide phase on its surface were prepared according to Japanese Patent O.P.I. Publication No. 183647/1989.
• the mixture was desalinized, washed, and redispersed in the same way as in EMP-1 in order to obtain an emulsion comprising grains having an average grain size of 0.40 ⁇ m and a coefficient of variation of 0.07.
• Results of X-ray diffraction measurements revealed formation of grains having localized silver bromide phase since the main peak appeared in correspondence with 100 mol% silver chloride and the secondary peak in correspondence with 60 to 90 mol% silver chloride.
• Em-19 This emulsion was optimally chemically sensitized using sodium thiosulfate, sodium chloroaurate, and the foregoing SB-1.
• the so-obtained emulsion was called Em-19. Note that during the preparation of Em-19, compound No. I-3 and K2IrCl6 were added respectively in the same amount as that added in Em-6 to the solution containing 79.8 g of sodium chloride.
• Em-21 was chemically sensitized in the same as in Em-19, except that during grain formation the potassium bromide content was changed. Also, Em-20 and Em-22 were prepared in the same way as in Em-10, except that the bromide content was changed. Further, emulsions chemically sensitized in the same way as in Em-19 were formed.
• Em-23 and Em-24 were prepared in the same way as in Em-19 and Em-22, respectively, except that I-15 was added instead of I-3.
• Sample Nos. 205 to 210 were prepared by coating these emulsions and were evaluated in the same as in Example 1. The results are as follows. Sample No. Emulsion Localized Br phase Br content (mol%) Sensitivity Reciprocity law characteristics Latent image stability 205 (inventive) Em-19 Yes 0.3 324 86 99 206 (inventive) Em-20 No 0 240 85 102 207 (inventive) Em-21 Yes 3.0 316 82 97 208 (inventive) Em-22 No 0.3 246 83 103 209 (inventive) Em-23 Yes 0.3 320 84 98 210 (inventive) Em-24 No 0.3 220 79 95
• sample No. 205 A comparison of sample No. 205 with sample No. 208 showed that the emulsion having a localized bromide phase, in particular, markedly brings out the effect of the invention, and the emulsion having a Br content of 0.3 mol% has far more excellent sensitivity and improved reciprocity law characteristics.

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